Chain Link Fences and Gates

SECTION 32 31 13

CHAIN LINK FENCES AND GATES

PART 1 GENERAL

1.01 SUMMARY

A. Section Includes:

1.  Chain link fence.

2.  Gates.

1.02 REFERENCES

A.  ASTM A53, Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless.

B.  ASTM A120, Specification for Galvanized Standard Weight (Schedule 40) Pipe.

C.  ASTM A392, Specification for Zinc-Coated Steel Chain-Link Fence Fabric.

D.  ASTM A491, Specification for Aluminum-Coated Steel Chain-Link Fence Fabric.

E.  ASTM A1011, Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, HighStrength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength.

F.  ASTM B429, Specification for Aluminum-Alloy Extruded Structural Pipe and Tube.

G.  ASTM F1083, Specification for Pipe, Steel, Hot-Dipped Zinc-Coated (Galvanized) Welded, for Fence Structures

H.  Chain Link Fence Manufacturers Institute (CLFMI) Product Manual.

PART 2 PRODUCTS

2.01 FENCE POSTS

A.  For Standard Fences:

1.  For fences 6’ or less, the pipe shall be Type 1, Schedule 40, standard weight, round steel pipe with galvanized coating weighing not less than 1.8 oz per sq. ft. of coated surface, complying with ASTM F1083.

2.  For fences greater than 6’ the pipe shall be Type 1, Schedule 40, standard weight, round steel pipe with galvanized coating weighing not less than 1.8 oz per sq. ft. of coated surface, complying with ASTM F1083.

3.  Posts shall a powder-cat finish, black in color.

B.  Pipe sizing shall utilize the following requirements:

1.  Posts

a.  Fence height 3.5’ to 6’: 2.5” O.D.

b.  Fence height 6.5’ to 10’: 3” O.D.

2.  Top, Intermediate and Bottom Rails: 1 5/8” O.D.

3.  Intermediate or Diagonal Bracing: 1 5/8” O.D.

4.  Gate Posts: refer to Manufacturers recommendations.

5.  Gate Frames: refer to Manufacturers recommendations.

C.  The above pipe diameters are the minimum allowable. The actual pipe diameters and weights of the fence posts and rails shall be determined by the installer based on local building codes, fence heights, wind speed design requirements and coverage of the fence fabric with windscreens, plywood or other wind blocking materials.

3.02 FENCE FABRIC

A.  Black Vinyl Coated Fabric

1.  Thermally fused to aluminum or galvanized steel wire fabric. The wire fabric shall be 9-gauge by 1 inch before the vinyl coating is applied.

2.  The thickness of the thermally fused vinyl coating shall be 0.007 inch.

3.  The vinyl coating shall be free from pinholes, bubbles, voids, and rough or blistered surfaces. The color of the vinyl coating shall be the same color, hue, and shade. Fence fabric that is non-uniform in color and appearance shall be rejected and replaced at no additional cost to the Owner.

B.  Fasteners.

1.  To terminal posts:

i.  Tension bars: Minimum 1/4 inch by 3/4 inch.

ii.  Clamps: 12 gauge by 1 inch wide.

iii.  Carriage bolts: Minimum 5/16-inch diameter.

2.  To line posts: Wire: 6-gauge aluminum.

3.  To rails: Wire: 6-gauge aluminum.

C.  Tension and Brace Bands.

1.  The tension and brace bands shall be 0.078” by 3/4” for posts less than 4” O.D. with 5/16” diameter galvanized carriage bolts.

2.  The tension and brace bands shall be 0.108” by 7/8” for posts 4” O.D. and larger with 5/16” diameter galvanized carriage bolts.

D.  Tension Bars.

1.  The tension bars shall be a minimum of 3/16” by 3/4” galvanized steel or vinyl coated where used with vinyl coated fences.

E.  Tie Wire.

1.  The tie wire shall be 6 gauge aluminum wire.

F.  Accessories.

1.  Provide galvanized steel or malleable iron post caps, sleeves, clamps, barbed or razor wire support arms, hinges, gate latches, keepers, and all other accessories required for the complete installation of the chain link fence and gates. Provide vinyl coated accessories for all vinyl coated fences.

3.03 RAILS

A. For standard fences: Top and bottom rails shall be installed. Center rails shall be installed on fences that are 6’ high or greater. Rails shall be powder coated.

3.04 DOME CAPS

A. Galvanized malleable steel dome caps shall be provided at all posts. Dome caps shall be vinyl coated or powder coated.

3.05 GATE ACCESSORIES

A.  Gate hinges shall be galvanized steel of adequate strength to support the gate with large bearing surfaces for clamping the gate in position. The hinges shall not twist or turn under the action of the gate under any conditions of use or abuse.

B.  Locking devices shall be galvanized steel forked latch for single gates.

D. Double swing gate latches shall be galvanized steel Commercial Strong Arm Latch Model DAC-4000 from Hoover Fence Company or approved equal.

3.06 BRACING

A. The fence bracing shall be 1-5/8 inch outside diameter Schedule 40 galvanized pipe as required.

PART 3 EXECUTION

3.01 INSTALLATION

A.  Remove and dispose of brush, trees, and other obstructions that interfere with construction of the fence.

B.  Lay out and measure the fence line parallel to the contour of the ground.

C.  Post Setting.

1.  For standard fences: Set corner, end, intermediate pull, and gate posts into concrete footings with a minimum diameter of 12 inches and a minimum depth of

54 inches. Place the posts such that bottom of the footing is 6 inches deeper than the bottom of the post. Place the concrete in a continuous pour and tamp around the posts for consolidation. Line posts may be air driven to a minimum depth of 4 feet. The top of the posts shall not be deformed at completion. Replace all deformed or damaged posts.

2.  Crown the tops of the footings to shed water.

3.  Space standard fence posts a maximum of 10 feet on-center.

D.  Posts and Rails.

1.  Set the terminal posts at the beginning and the end of each continuous, straight-line length of fence and at abrupt changes in vertical or horizontal alignment.

2.  Set line posts at intervals stated above, measured parallel to the grade of the fence.

3.  Install intermediate pull posts at a maximum interval of 200 feet.

4.  Install a continuous top rail. Install the top rail through loop caps on the line posts. Provide sleeve splices in the top rail and only cut the pipe at the ends of runs. Install a bottom rail with terminations at each post. Install middle rails as specified.

5.  Provide horizontal bracing at corner posts, terminal posts, and intermediate pull posts. Install the bracing at the mid-height of the fence, between the corner, terminal, or pull posts and the next adjacent line post. Fasten the bracing to the posts with brace bands and carriage bolts.

E.  Fabric.

1.  Stretch the fabric and tension wire, if applicable, to the proper tension between the terminal posts as recommended by the manufacturer. Fasten the fabric securely to the framework.

2.  Attach the fabric to the terminal posts with tension bar clamps and carriage bolts.

3.  Attach the fabric to the line posts and rails with wire spaced 12 inches on-center.

4.  Install the fabric a maximum of 1” above the finished elevations.

F.  Gates.

1.  Provide manually operated, hinged gates of the sizes indicated. Furnish all required hardware, latches, and locking devices.

2.  Assemble the gate frames with welds or with specially fabricated fittings. Paint welds with aluminum based paint upon completion.

3.  Attach the gate fabric to the gate frame at 14” intervals on all sides. Use the same fabric as the adjacent fence.

G.  Adjustments.

1.  Hardware and Accessories.

a. Adjust all hardware, including cantilever gate tracks and rollers, latches, and locking devices for the proper operation without sticking, binding, or dragging.

2.  Repair and Replacement.

a. Repair or replace at no additional cost to the Owner all fence materials, gates, and posts damaged by the construction work prior to the completion

and final acceptance of the work. This includes, but is not limited to, all the work associated with the General Contractor and all Subcontractors.

H.  Adjust the tension rods and brace rails for rigid installation.

I.  Properly tighten all fasteners, hardware, and accessories.

J.  Remove all excess materials and debris from the project site.

K.  The fence installation shall be in accordance with the manufacturer’s instructions and performed by skilled installers experienced in fence installations.

L.  Concrete.

1.  The concrete shall comply with all applicable provisions of ASTM C94 with a minimum compressive strength of 4300 psi at 28 days and a maximum aggregate size of 3/4” (MnDOT 3Y32 mix). Refer to other Sections for additional requirements.

END OF SECTION

32 31 13 - 5

Fences and Gates